The isotope most likely to be used to study the thyroid gland is
A) thallium-201. B) iodine-131. C) iron-59. D) cobalt-60.
B
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In the embryonic differentiation of a normal male
A. Mullerian inhibiting substance is absent. B. the Wolffian ducts regress. C. testosterone directly stimulates development of the epididymis, vas deferens, and seminal vesicles. D. undifferentiated gonads develop into testes during the fifth week of embryonic life. E. testosterone directly stimulates development of the penis and scrotum.
Which of the following statements about bone growth is TRUE?
A. Appositional bone growth results in increased bone length. B. Most growth in long bones results from interstitial growth. C. Bones cannot grow by appositional growth. D. In the epiphyseal plate, osteoblasts degenerate to form chondrocytes. E. Endochondral growth in long bones occurs at the epiphyseal plate.
How is it possible to remove a section of lung without damaging neighboring sections?
A. The bronchopulmonary segments are separated from each other by connective tissue septa. B. Surgeons cauterize any freshly cut portion of the lung to seal it. C. Lungs are actually comprised of multiple separate structures each served by its own bronchus. D. It isn't possible to perform this type of surgery on the lungs.
In a neuron, the greatest concentration of neurotransmitter is found in the
A) cell body. B) collateral branches. C) terminal arborization. D) synaptic knobs.